JP2588874Y2 - Rear-end collision warning system for vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle rear-end collision warning device.

[0002]

2. Description of the Related Art Conventionally, in a rear-end collision warning device for a truck or the like, an alarm generation distance (inter-vehicle distance) is set to several steps (far, middle, and distance) depending on traffic volume, driver skill, driver physical condition, and the like.
There have been proposed ones that can be selected in the following three stages (for example, Japanese Utility Model Laid-Open No. 2-7153).

When the key switch of the vehicle is once turned off with the warning inter-vehicle distance being set at a desired stage, and then turned on again, usually at the time of start (key switch ON or power switch) for convenience. ON
At the time), it returns to a fixed position (middle).

[0004]

However, if the driver once sets the warning inter-vehicle distance to "far", stops once, turns off the key switch, and then returns to "medium" when riding again, an alarm is issued. The result will be different from the set distance between vehicles.

[0005] Therefore, the sense (recognition) of the inter-vehicle warning distance
There is a sense of incongruity because an alarm is given at an unexpected place due to the difference. In particular, when another driver gets on, the feeling is great. In addition, there is a risk of a rear-end collision due to a difference in recognition of the warning inter-vehicle distance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a rear-end collision warning device for a vehicle that prevents an alarm from being generated at an unexpected place due to a difference in sense (recognition) of an inter-vehicle distance and avoids a risk of a rear-end collision. The purpose is to provide.

[0007]

Means for Solving the Problems The invention according to claim 1 is:
Vehicle speed detecting means, an inter-vehicle distance detecting means comprising a laser radar head, an alarm inter-vehicle distance variable switch capable of variably setting an inter-vehicle alarm distance in a plurality of steps, and an own vehicle speed for calculating the own vehicle speed based on a signal from the vehicle speed detecting means Calculating means, a relative speed calculating means for calculating a relative speed between the preceding vehicle and the own vehicle based on a signal from the inter-vehicle distance detecting means, and a safe inter-vehicle distance based on signals from the own vehicle speed calculating means and a warning inter-vehicle distance variable switch. A safe inter-vehicle distance calculating means, a front vehicle speed calculating means for calculating a forward vehicle speed based on signals from the own vehicle speed calculating means and the relative speed calculating means, and an alarm which issues an alarm when the actual inter-vehicle distance is smaller than the safe inter-vehicle distance. and determination means, the collision warning apparatus for a vehicle including an alarm generating means for generating an alarm based on a signal from the alarm determination means, Ahn
Turn off the key switch of the vehicle to the all-vehicle distance calculation means.
After that, when the key switch is turned on, the key switch is turned off.
Storage means or hold means to restore the state at the time of
The steps are connected, and the safe inter-vehicle distance calculation means uses the vehicle's Keith
By changing the inter-vehicle distance after the switch-on,
When the inter-vehicle distance is set to a predetermined level, the set alarm
It is characterized by selecting the distance between cars . Claim 2
The invention described is a vehicle speed detecting means and a laser radar head.
Inter-vehicle distance detection means consisting of multiple warning inter-vehicle distances
Variable inter-vehicle distance switch that can be set
Vehicle speed calculation to calculate the vehicle speed based on the signal from the output means
Means and a vehicle ahead based on a signal from the inter-vehicle distance detecting means.
Relative speed calculating means for calculating a relative speed between the vehicle and the own vehicle;
Signal from vehicle speed calculation means and warning inter-vehicle distance variable switch
Safe inter-vehicle distance calculating means for calculating safe inter-vehicle distance based on
And the signals from the vehicle speed calculation means and the relative speed calculation means
Forward vehicle speed calculating means for calculating a forward vehicle speed,
A warning that issues an alarm when the actual inter-vehicle distance is smaller than the safe inter-vehicle distance
Based on the signal from the alarm generation determining means and the alarm generation determining means.
Rear-end collision warning system for vehicles equipped with an alarm generating means for generating an alarm
The keyway of the vehicle
Switch is turned off, and then the key switch is turned on.
-Storage means to restore the state when the switch was turned off
Or, the holding means is connected, and the safe inter-vehicle distance calculating means is connected.
, An alarm during the on from the vehicles of the key switch off vehicle
By changing the distance, the warning inter-vehicle distance can be set to a predetermined level.
When set, the set distance between alarm vehicles is set by key switch.
The switch is selected when the switch is turned on.

[0008]

According to the first aspect of the present invention , since the storage means or the hold means is connected to the safe inter-vehicle distance calculating means, the key switch of the vehicle is once turned off with the alarm inter-vehicle distance set at a predetermined stage. Then, the warning inter-vehicle distance at the time when the key switch is turned off is stored and held by the storage means or the hold means. Once the vehicle Keith
Switch off, then key switch on, then alarm
If the inter-vehicle distance is not changed, then, when the key switch is turned on again , the inter-vehicle distance at the time when the key switch stored in the storage means or the hold means is turned off is restored, and a signal is sent to the safe inter-vehicle distance calculation means as a signal. The safe inter-vehicle distance is obtained from the transmitted signal and the signal from the own vehicle speed calculation means. Once the vehicle key switch
Turn off the key switch, then turn on the key switch.
When the separation is changed, it becomes as follows. Once the vehicle
After turning off the key switch and then turning on the key switch
The alarm inter-vehicle distance is set by operating the inter-alarm distance variable switch.
Signal is newly set and the warning distance signal is changed.
It is. The changed inter-vehicle distance is transmitted to the storage means.
The status of the alarm means is changed
The distance between them is selected. In the device according to claim 2,
The safe inter-vehicle distance calculation means includes storage means or hold means.
Connected, so the warning inter-vehicle distance can be set to a predetermined level.
Once the vehicle's key switch is turned off in the
When the key switch is turned off by means or hold means
The warning inter-vehicle distance in the state of the point is stored and held. Once
Turn off the key switch of the vehicle and then turn on the key switch
If you change the inter-vehicle distance during the warning,
become. Turn off the vehicle's key switch, and then
Operation of the inter-vehicle distance variable switch while the switch is on
The signal of the distance between warnings is newly set by the
The distance signal is changed. The changed inter-vehicle distance is
Is transmitted to the storage means, and the state in the storage means is changed.
The set warning inter-vehicle distance is selected.

Therefore, it is possible to prevent an alarm from being generated at an unexpected place due to a difference in the sense (recognition) of the inter-vehicle distance.
The risk of rear-end collision is avoided.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG.
4 to 4 show an embodiment of the rear-end collision warning device for a vehicle according to the present invention.

FIG. 1 is a control block diagram of a rear-end collision warning device according to one embodiment of the present invention, and FIG. 2 is an overall configuration diagram. In the figure, reference numeral 1 denotes a vehicle speed detecting means comprising a vehicle speed sensor, which is provided below the actual vehicle A. Reference numeral 2 denotes an inter-vehicle distance detecting means including a laser radar head, which is provided on the cross member. As shown in FIG. 3, the inter-vehicle distance detecting means 2 irradiates the laser beam C forward, and determines the distance between the actual vehicle A and the preceding vehicle B from the time when the reflected light C1 from the reflector b of the preceding vehicle B returns. The distance D is detected. Reference numeral 3 denotes a warning inter-vehicle distance variable switch capable of variably setting a warning inter-vehicle distance in a plurality of steps. The switch 3 determines a judgment time Tx (warning inter-vehicle distance) until a braking operation is performed, for example, Txs...・ Alarm generation is normal (intermediate) Txl ・ ・ Alarm generation is delayed (close).

Reference numeral 11 denotes a key switch of the vehicle, which is provided on the steering device. The vehicle speed detecting means 1, the inter-vehicle distance detecting means 2, the warning inter-vehicle distance variable switch 3 and the key switch 11 are connected to the input side of an information processing device 10 composed of a micro computer. The information processing device 10 includes a host vehicle speed calculation unit 4, a relative speed calculation unit 5, a safe inter-vehicle distance calculation unit 6, a forward vehicle speed calculation unit 7, an alarm generation determination unit 8, and a storage unit 9.

The vehicle speed calculating means 4 includes a vehicle speed detecting means 1.
To calculate the own vehicle speed based on the vehicle speed signal from the vehicle speed detecting means 1. The relative speed calculating means 5 is connected to the inter-vehicle distance detecting means 2 and calculates a relative speed between the real vehicle A and the speed of the preceding vehicle B based on a temporal change of the inter-vehicle distance from the inter-vehicle distance detecting means 2.

The safe inter-vehicle distance calculating means 6 is connected to the own vehicle speed calculating means 4 and the warning inter-vehicle distance variable switch 3, and calculates the safe inter-vehicle distance based on signals from the own vehicle speed calculating means 4 and the alarm inter-vehicle distance variable switch 3. .

The safe inter-vehicle distance Dr is obtained from the vehicle speed Vf, the idle running time Td (for example, fixed to 1 second), and the judgment time Tx (inter-vehicle inter-vehicle distance) until braking is performed, as follows: Dr = Vf (Td + Tx) As described above, Tx is set in an arithmetic progression to three types of Txs, Txm, and Txl, and the safe inter-vehicle distances Drs, Drm, and Drl are obtained from them.

The forward vehicle speed calculating means 7 is connected to the own vehicle speed calculating means 4 and the relative speed calculating means 5, and
And a signal from the relative speed calculating means 5 to calculate the forward vehicle speed.

The alarm generation judging means 8 is connected to the safe inter-vehicle distance calculating means 6 and the front vehicle speed calculating means 7, receives a signal from the front vehicle speed calculating means 7, and receives the safe inter-vehicle distances Dr, D
By comparing s with the actual inter-vehicle distance D, it is determined whether or not an alarm buzzer should be generated as an alarm generation factor area.

Here, V1... Actual vehicle speed V2... Forward vehicle speed α1... Own vehicle braking deceleration α2... Forward vehicle braking deceleration Dr.. Inter-vehicle distance Td ···· Idle running time (for example, fixed to 1 second) Tx ·························································································· Ds = V1 (Td + Ty) + (V1 ² / 2α1)

Therefore, when D <Dr, D <Ds, an alarm is issued from the alarm generation means 12 connected to the alarm generation determination means 8. The key switch 11 is connected to a storage means 9 composed of an input / output circuit 13, an arithmetic circuit 14, and a storage circuit 15, and the storage means 9 is connected to a safe inter-vehicle distance calculation means 6 to set a warning inter-vehicle distance. Once the key switch 11 of the vehicle is turned off in the state set in stages,
The storage unit 9 stores the warning inter-vehicle distance Tx at a predetermined stage. Thereafter, when the key switch 11 is turned on again, the key switch stored in the storage means 9 is turned off.
The warning inter-vehicle distance signal at the time of the
Sent to That is, the set warning inter-vehicle distances Txs, Txm, Txl before the key switch 11 is turned on are selected, and the safe inter-vehicle distances Dr, Ds are determined.

Next, the operation of the embodiment of the present invention will be described with reference to FIG. The program is written in the memory of the microcomputer as shown in FIG.

The warning inter-vehicle distance Txs selected by the inter-vehicle inter-vehicle distance variable switch 3 (to speed up the generation of an alarm), Txm
(Alarm generation is made normal), Txl (reduces alarm generation) is read (step S1). Next, initialization such as idle running time (for example, fixed to 1 second) is performed (Step S).
2) Based on the vehicle speed signal from the vehicle speed detecting means 1, the own vehicle speed calculating means 4 calculates the own vehicle speed Vf (step S3).

The warning inter-vehicle distance T read into the storage means 9
xs, Txm, Txl to warning inter-vehicle distance variable switch 3
Is calculated (step S4). Next, the actual inter-vehicle distance D is calculated by the inter-vehicle distance detecting means 2 and the relative speed calculating means 5 is calculated.
Calculates the relative speed between the preceding vehicle B and the own vehicle A, calculates the speed of the preceding vehicle B by the front vehicle speed calculating means 7 (step S5), and calculates the own vehicle speed calculating means 4 and the warning by the safe inter-vehicle distance calculating means 6. Based on the signals of the following distances Txs, Txm, Txl, the safe following distances Dr, Ds are calculated (step S).
6).

Thereafter, the alarm occurrence determining means 8 determines that D <D
It is calculated whether or not r, D <Ds (step S
7) If D <Dr, D <Ds, step S
Returning to 3, if D <Dr, D <Ds, a signal is sent to the alarm generation means 12 to issue an alarm.

Therefore, at the time of start, that is, the key switch 1
When 1 is turned on, the warning inter-vehicle distance Tx does not return to Txm (medium), and the set alarm inter-vehicle distances Txs, Txm, Txl before the key switch 11 is turned on are selected, and the sense (recognition) of the alarm inter-vehicle distance is selected. The occurrence of an alarm at an unexpected place due to a difference is prevented. Turn off key switch 11 and then Keith
While the switch 11 is turned on, a new warning distance
The inter-vehicle distances Txs, T
xm, Txl signal is set, the warning
The distance signal is changed. The changed inter-vehicle distance is
Is transmitted to the storage means, and the state in the storage means is changed.
The set warning inter-vehicle distance is selected. Its set
Based on the warning inter-vehicle distance signal,
s is calculated. Then, the risk of a rear-end collision due to a difference in recognition of the inter-warning distance is avoided. Also, the key switch 11
After turning off and then turning on key switch 11
Is newly activated by operating the inter-vehicle distance variable switch 3.
Signals of the inter-vehicle distances Txs, Txm, Txl are set.
Thereby, the signal of the warning inter-vehicle distance is changed. Changed
The warning inter-vehicle distance is transmitted to the storage means, and is stored in the storage means.
Is changed, and the set distance between warning vehicles is selected.
It is. Based on the set warning inter-vehicle distance signal,
All inter-vehicle distances Dr and Ds are calculated. Then, the risk of a rear-end collision due to a difference in recognition of the inter-warning distance is avoided.

FIG. 5 shows another embodiment of the present invention. In place of the storage means 9 of the above-described embodiment, a key switch 11 is provided with an input / output circuit 16, a resistor 17, a relay 18, and a storage circuit 19. 20 are connected.

In this embodiment, the same effects as in the above embodiment can be obtained.

[0027]

As described above, according to the present invention, it is possible to prevent the occurrence of an alarm at an unexpected place due to a difference in the sense (recognition) of the inter-vehicle distance and to avoid the possibility of a rear-end collision.

[Brief description of the drawings]

FIG. 1 is a control block diagram of an embodiment of the present invention.

FIG. 2 is an overall configuration diagram of an embodiment of the present invention.

FIG. 3 is a diagram illustrating the operation of the inter-vehicle distance detecting means of the present invention.

FIG. 4 is a control flowchart of the present invention.

FIG. 5 is a control block diagram of another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 vehicle speed detecting means 2 inter-vehicle distance detecting means 3 warning inter-vehicle distance variable switch 4 own vehicle speed calculating means 5 relative speed calculating means 6 safe inter-vehicle distance calculating means 7 forward vehicle speed calculating means 8 alarm determining means 9 storage means 11 key switch 12 alarm generation Means 20 Hold means A Own vehicle B Forward vehicle

Claims (2)

(57) [Scope of request for utility model registration] 1. An inter-vehicle distance detecting means comprising a vehicle speed detecting means, a laser radar head, a warning inter-vehicle distance variable switch capable of variably setting a warning inter-vehicle distance in a plurality of stages, and a vehicle speed based on a signal from the vehicle speed detecting means. Vehicle speed calculation means for calculating the vehicle speed, relative speed calculation means for calculating the relative speed between the preceding vehicle and the own vehicle based on a signal from the inter-vehicle distance detection means, and a signal from the own vehicle speed calculation means and a warning inter-vehicle distance variable switch. A safe inter-vehicle distance calculating means for calculating a safe inter-vehicle distance based on, a forward vehicle speed calculating means for calculating a forward vehicle speed based on signals from the own vehicle speed calculating means and the relative speed calculating means,
In a rear-end collision warning device for a vehicle having an alarm generation determining means for issuing an alarm when the actual inter-vehicle distance is smaller than the safe inter-vehicle distance and an alarm generating means for issuing an alarm based on a signal from the alarm generation determining means, Turn off the vehicle key switch
Then, when the key switch is turned on, the key switch is
Storage means or hold to restore the state at the time of turning off
Means are connected, and the safe following distance calculating means is turned on after the vehicle key switch is turned on.
The warning inter-vehicle distance is changed by changing the
When set at a predetermined stage, the set warning inter-vehicle distance is selected.
Collision warning apparatus for a vehicle, characterized by comprising a constant. 2. A vehicle speed detecting means, and a laser radar head.
Inter-vehicle distance detection means consisting of multiple warning inter-vehicle distances
Variable inter-vehicle distance switch that can be set
Vehicle speed calculation to calculate the vehicle speed based on the signal from the output means
Means and a vehicle ahead based on a signal from the inter-vehicle distance detecting means.
Relative speed calculating means for calculating a relative speed between the vehicle and the own vehicle;
Signal from vehicle speed calculation means and warning inter-vehicle distance variable switch
Safe inter-vehicle distance calculating means for calculating safe inter-vehicle distance based on
And the signals from the vehicle speed calculation means and the relative speed calculation means
Forward vehicle speed calculating means for calculating a forward vehicle speed,
A warning that issues an alarm when the actual inter-vehicle distance is smaller than the safe inter-vehicle distance
Based on the signal from the alarm generation determining means and the alarm generation determining means.
Rear-end collision warning system for vehicles equipped with an alarm generating means for generating an alarm
In location, the safe inter-vehicle distance calculating means, turns off the key switch of the vehicle
Then, when the key switch is turned on, the key switch is
Storage means or hold to restore the state at the time of turning off
Means are connected, and the safe inter-vehicle distance calculating means determines whether the key switch of the vehicle is off.
By changing the inter-vehicle distance while the
When the inter-vehicle distance is set to a predetermined level, the set alarm
This formed by selecting a vehicle-to-vehicle distance when you turn on the key switch
And a rear-end collision warning device for a vehicle.